11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Copyright (C) International Business Machines Corp., 2000-2004 31da177e4SLinus Torvalds * Copyright (C) Christoph Hellwig, 2002 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 61da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 71da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 81da177e4SLinus Torvalds * (at your option) any later version. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 111da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 121da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 131da177e4SLinus Torvalds * the GNU General Public License for more details. 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 161da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 171da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds 2016f7e0feSRandy Dunlap #include <linux/capability.h> 211da177e4SLinus Torvalds #include <linux/fs.h> 221da177e4SLinus Torvalds #include <linux/xattr.h> 239a59f452SChristoph Hellwig #include <linux/posix_acl_xattr.h> 245a0e3ad6STejun Heo #include <linux/slab.h> 251da177e4SLinus Torvalds #include <linux/quotaops.h> 261d15b10fSDave Kleikamp #include <linux/security.h> 271da177e4SLinus Torvalds #include "jfs_incore.h" 281da177e4SLinus Torvalds #include "jfs_superblock.h" 291da177e4SLinus Torvalds #include "jfs_dmap.h" 301da177e4SLinus Torvalds #include "jfs_debug.h" 311da177e4SLinus Torvalds #include "jfs_dinode.h" 321da177e4SLinus Torvalds #include "jfs_extent.h" 331da177e4SLinus Torvalds #include "jfs_metapage.h" 341da177e4SLinus Torvalds #include "jfs_xattr.h" 351da177e4SLinus Torvalds #include "jfs_acl.h" 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds /* 381da177e4SLinus Torvalds * jfs_xattr.c: extended attribute service 391da177e4SLinus Torvalds * 401da177e4SLinus Torvalds * Overall design -- 411da177e4SLinus Torvalds * 421da177e4SLinus Torvalds * Format: 431da177e4SLinus Torvalds * 441da177e4SLinus Torvalds * Extended attribute lists (jfs_ea_list) consist of an overall size (32 bit 451da177e4SLinus Torvalds * value) and a variable (0 or more) number of extended attribute 461da177e4SLinus Torvalds * entries. Each extended attribute entry (jfs_ea) is a <name,value> double 471da177e4SLinus Torvalds * where <name> is constructed from a null-terminated ascii string 481da177e4SLinus Torvalds * (1 ... 255 bytes in the name) and <value> is arbitrary 8 bit data 491da177e4SLinus Torvalds * (1 ... 65535 bytes). The in-memory format is 501da177e4SLinus Torvalds * 511da177e4SLinus Torvalds * 0 1 2 4 4 + namelen + 1 521da177e4SLinus Torvalds * +-------+--------+--------+----------------+-------------------+ 531da177e4SLinus Torvalds * | Flags | Name | Value | Name String \0 | Data . . . . | 541da177e4SLinus Torvalds * | | Length | Length | | | 551da177e4SLinus Torvalds * +-------+--------+--------+----------------+-------------------+ 561da177e4SLinus Torvalds * 571da177e4SLinus Torvalds * A jfs_ea_list then is structured as 581da177e4SLinus Torvalds * 591da177e4SLinus Torvalds * 0 4 4 + EA_SIZE(ea1) 601da177e4SLinus Torvalds * +------------+-------------------+--------------------+----- 611da177e4SLinus Torvalds * | Overall EA | First FEA Element | Second FEA Element | ..... 621da177e4SLinus Torvalds * | List Size | | | 631da177e4SLinus Torvalds * +------------+-------------------+--------------------+----- 641da177e4SLinus Torvalds * 651da177e4SLinus Torvalds * On-disk: 661da177e4SLinus Torvalds * 671da177e4SLinus Torvalds * FEALISTs are stored on disk using blocks allocated by dbAlloc() and 681da177e4SLinus Torvalds * written directly. An EA list may be in-lined in the inode if there is 691da177e4SLinus Torvalds * sufficient room available. 701da177e4SLinus Torvalds */ 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds struct ea_buffer { 731da177e4SLinus Torvalds int flag; /* Indicates what storage xattr points to */ 741da177e4SLinus Torvalds int max_size; /* largest xattr that fits in current buffer */ 751da177e4SLinus Torvalds dxd_t new_ea; /* dxd to replace ea when modifying xattr */ 761da177e4SLinus Torvalds struct metapage *mp; /* metapage containing ea list */ 771da177e4SLinus Torvalds struct jfs_ea_list *xattr; /* buffer containing ea list */ 781da177e4SLinus Torvalds }; 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds /* 811da177e4SLinus Torvalds * ea_buffer.flag values 821da177e4SLinus Torvalds */ 831da177e4SLinus Torvalds #define EA_INLINE 0x0001 841da177e4SLinus Torvalds #define EA_EXTENT 0x0002 851da177e4SLinus Torvalds #define EA_NEW 0x0004 861da177e4SLinus Torvalds #define EA_MALLOC 0x0008 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds 896c8f980cSAndreas Gruenbacher /* 906c8f980cSAndreas Gruenbacher * Mapping of on-disk attribute names: for on-disk attribute names with an 916c8f980cSAndreas Gruenbacher * unknown prefix (not "system.", "user.", "security.", or "trusted."), the 926c8f980cSAndreas Gruenbacher * prefix "os2." is prepended. On the way back to disk, "os2." prefixes are 936c8f980cSAndreas Gruenbacher * stripped and we make sure that the remaining name does not start with one 946c8f980cSAndreas Gruenbacher * of the know prefixes. 956c8f980cSAndreas Gruenbacher */ 966c8f980cSAndreas Gruenbacher 97aca0fa34SDave Kleikamp static int is_known_namespace(const char *name) 98aca0fa34SDave Kleikamp { 99aca0fa34SDave Kleikamp if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) && 100aca0fa34SDave Kleikamp strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && 101aca0fa34SDave Kleikamp strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && 102aca0fa34SDave Kleikamp strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) 103aca0fa34SDave Kleikamp return false; 104aca0fa34SDave Kleikamp 105aca0fa34SDave Kleikamp return true; 106aca0fa34SDave Kleikamp } 107aca0fa34SDave Kleikamp 1081da177e4SLinus Torvalds static inline int name_size(struct jfs_ea *ea) 1091da177e4SLinus Torvalds { 1106c8f980cSAndreas Gruenbacher if (is_known_namespace(ea->name)) 1111da177e4SLinus Torvalds return ea->namelen; 1126c8f980cSAndreas Gruenbacher else 1136c8f980cSAndreas Gruenbacher return ea->namelen + XATTR_OS2_PREFIX_LEN; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds static inline int copy_name(char *buffer, struct jfs_ea *ea) 1171da177e4SLinus Torvalds { 1181da177e4SLinus Torvalds int len = ea->namelen; 1191da177e4SLinus Torvalds 1206c8f980cSAndreas Gruenbacher if (!is_known_namespace(ea->name)) { 1211da177e4SLinus Torvalds memcpy(buffer, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN); 1221da177e4SLinus Torvalds buffer += XATTR_OS2_PREFIX_LEN; 1231da177e4SLinus Torvalds len += XATTR_OS2_PREFIX_LEN; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds memcpy(buffer, ea->name, ea->namelen); 1261da177e4SLinus Torvalds buffer[ea->namelen] = 0; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds return len; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* Forward references */ 1321da177e4SLinus Torvalds static void ea_release(struct inode *inode, struct ea_buffer *ea_buf); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* 1351da177e4SLinus Torvalds * NAME: ea_write_inline 1361da177e4SLinus Torvalds * 1371da177e4SLinus Torvalds * FUNCTION: Attempt to write an EA inline if area is available 1381da177e4SLinus Torvalds * 1391da177e4SLinus Torvalds * PRE CONDITIONS: 1401da177e4SLinus Torvalds * Already verified that the specified EA is small enough to fit inline 1411da177e4SLinus Torvalds * 1421da177e4SLinus Torvalds * PARAMETERS: 1431da177e4SLinus Torvalds * ip - Inode pointer 1441da177e4SLinus Torvalds * ealist - EA list pointer 1451da177e4SLinus Torvalds * size - size of ealist in bytes 1461da177e4SLinus Torvalds * ea - dxd_t structure to be filled in with necessary EA information 1471da177e4SLinus Torvalds * if we successfully copy the EA inline 1481da177e4SLinus Torvalds * 1491da177e4SLinus Torvalds * NOTES: 1501da177e4SLinus Torvalds * Checks if the inode's inline area is available. If so, copies EA inline 1511da177e4SLinus Torvalds * and sets <ea> fields appropriately. Otherwise, returns failure, EA will 1521da177e4SLinus Torvalds * have to be put into an extent. 1531da177e4SLinus Torvalds * 1541da177e4SLinus Torvalds * RETURNS: 0 for successful copy to inline area; -1 if area not available 1551da177e4SLinus Torvalds */ 1561da177e4SLinus Torvalds static int ea_write_inline(struct inode *ip, struct jfs_ea_list *ealist, 1571da177e4SLinus Torvalds int size, dxd_t * ea) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds struct jfs_inode_info *ji = JFS_IP(ip); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 1621da177e4SLinus Torvalds * Make sure we have an EA -- the NULL EA list is valid, but you 1631da177e4SLinus Torvalds * can't copy it! 1641da177e4SLinus Torvalds */ 1651da177e4SLinus Torvalds if (ealist && size > sizeof (struct jfs_ea_list)) { 1661da177e4SLinus Torvalds assert(size <= sizeof (ji->i_inline_ea)); 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* 1691da177e4SLinus Torvalds * See if the space is available or if it is already being 1701da177e4SLinus Torvalds * used for an inline EA. 1711da177e4SLinus Torvalds */ 1721da177e4SLinus Torvalds if (!(ji->mode2 & INLINEEA) && !(ji->ea.flag & DXD_INLINE)) 1731da177e4SLinus Torvalds return -EPERM; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds DXDsize(ea, size); 1761da177e4SLinus Torvalds DXDlength(ea, 0); 1771da177e4SLinus Torvalds DXDaddress(ea, 0); 1781da177e4SLinus Torvalds memcpy(ji->i_inline_ea, ealist, size); 1791da177e4SLinus Torvalds ea->flag = DXD_INLINE; 1801da177e4SLinus Torvalds ji->mode2 &= ~INLINEEA; 1811da177e4SLinus Torvalds } else { 1821da177e4SLinus Torvalds ea->flag = 0; 1831da177e4SLinus Torvalds DXDsize(ea, 0); 1841da177e4SLinus Torvalds DXDlength(ea, 0); 1851da177e4SLinus Torvalds DXDaddress(ea, 0); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* Free up INLINE area */ 1881da177e4SLinus Torvalds if (ji->ea.flag & DXD_INLINE) 1891da177e4SLinus Torvalds ji->mode2 |= INLINEEA; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds return 0; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* 1961da177e4SLinus Torvalds * NAME: ea_write 1971da177e4SLinus Torvalds * 1981da177e4SLinus Torvalds * FUNCTION: Write an EA for an inode 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * PRE CONDITIONS: EA has been verified 2011da177e4SLinus Torvalds * 2021da177e4SLinus Torvalds * PARAMETERS: 2031da177e4SLinus Torvalds * ip - Inode pointer 2041da177e4SLinus Torvalds * ealist - EA list pointer 2051da177e4SLinus Torvalds * size - size of ealist in bytes 2061da177e4SLinus Torvalds * ea - dxd_t structure to be filled in appropriately with where the 2071da177e4SLinus Torvalds * EA was copied 2081da177e4SLinus Torvalds * 2091da177e4SLinus Torvalds * NOTES: Will write EA inline if able to, otherwise allocates blocks for an 2101da177e4SLinus Torvalds * extent and synchronously writes it to those blocks. 2111da177e4SLinus Torvalds * 2121da177e4SLinus Torvalds * RETURNS: 0 for success; Anything else indicates failure 2131da177e4SLinus Torvalds */ 2141da177e4SLinus Torvalds static int ea_write(struct inode *ip, struct jfs_ea_list *ealist, int size, 2151da177e4SLinus Torvalds dxd_t * ea) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds struct super_block *sb = ip->i_sb; 2181da177e4SLinus Torvalds struct jfs_inode_info *ji = JFS_IP(ip); 2191da177e4SLinus Torvalds struct jfs_sb_info *sbi = JFS_SBI(sb); 2201da177e4SLinus Torvalds int nblocks; 2211da177e4SLinus Torvalds s64 blkno; 2221da177e4SLinus Torvalds int rc = 0, i; 2231da177e4SLinus Torvalds char *cp; 2241da177e4SLinus Torvalds s32 nbytes, nb; 2251da177e4SLinus Torvalds s32 bytes_to_write; 2261da177e4SLinus Torvalds struct metapage *mp; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* 2291da177e4SLinus Torvalds * Quick check to see if this is an in-linable EA. Short EAs 2301da177e4SLinus Torvalds * and empty EAs are all in-linable, provided the space exists. 2311da177e4SLinus Torvalds */ 2321da177e4SLinus Torvalds if (!ealist || size <= sizeof (ji->i_inline_ea)) { 2331da177e4SLinus Torvalds if (!ea_write_inline(ip, ealist, size, ea)) 2341da177e4SLinus Torvalds return 0; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* figure out how many blocks we need */ 2381da177e4SLinus Torvalds nblocks = (size + (sb->s_blocksize - 1)) >> sb->s_blocksize_bits; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds /* Allocate new blocks to quota. */ 2415dd4056dSChristoph Hellwig rc = dquot_alloc_block(ip, nblocks); 2425dd4056dSChristoph Hellwig if (rc) 2435dd4056dSChristoph Hellwig return rc; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds rc = dbAlloc(ip, INOHINT(ip), nblocks, &blkno); 2461da177e4SLinus Torvalds if (rc) { 2471da177e4SLinus Torvalds /*Rollback quota allocation. */ 2485dd4056dSChristoph Hellwig dquot_free_block(ip, nblocks); 2491da177e4SLinus Torvalds return rc; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds /* 2531da177e4SLinus Torvalds * Now have nblocks worth of storage to stuff into the FEALIST. 2541da177e4SLinus Torvalds * loop over the FEALIST copying data into the buffer one page at 2551da177e4SLinus Torvalds * a time. 2561da177e4SLinus Torvalds */ 2571da177e4SLinus Torvalds cp = (char *) ealist; 2581da177e4SLinus Torvalds nbytes = size; 2591da177e4SLinus Torvalds for (i = 0; i < nblocks; i += sbi->nbperpage) { 2601da177e4SLinus Torvalds /* 2611da177e4SLinus Torvalds * Determine how many bytes for this request, and round up to 2621da177e4SLinus Torvalds * the nearest aggregate block size 2631da177e4SLinus Torvalds */ 2641da177e4SLinus Torvalds nb = min(PSIZE, nbytes); 2651da177e4SLinus Torvalds bytes_to_write = 2661da177e4SLinus Torvalds ((((nb + sb->s_blocksize - 1)) >> sb->s_blocksize_bits)) 2671da177e4SLinus Torvalds << sb->s_blocksize_bits; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds if (!(mp = get_metapage(ip, blkno + i, bytes_to_write, 1))) { 2701da177e4SLinus Torvalds rc = -EIO; 2711da177e4SLinus Torvalds goto failed; 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds memcpy(mp->data, cp, nb); 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds /* 2771da177e4SLinus Torvalds * We really need a way to propagate errors for 2781da177e4SLinus Torvalds * forced writes like this one. --hch 2791da177e4SLinus Torvalds * 2801da177e4SLinus Torvalds * (__write_metapage => release_metapage => flush_metapage) 2811da177e4SLinus Torvalds */ 2821da177e4SLinus Torvalds #ifdef _JFS_FIXME 2831da177e4SLinus Torvalds if ((rc = flush_metapage(mp))) { 2841da177e4SLinus Torvalds /* 2851da177e4SLinus Torvalds * the write failed -- this means that the buffer 2861da177e4SLinus Torvalds * is still assigned and the blocks are not being 2871da177e4SLinus Torvalds * used. this seems like the best error recovery 2881da177e4SLinus Torvalds * we can get ... 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds goto failed; 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds #else 2931da177e4SLinus Torvalds flush_metapage(mp); 2941da177e4SLinus Torvalds #endif 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds cp += PSIZE; 2971da177e4SLinus Torvalds nbytes -= nb; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds ea->flag = DXD_EXTENT; 3011da177e4SLinus Torvalds DXDsize(ea, le32_to_cpu(ealist->size)); 3021da177e4SLinus Torvalds DXDlength(ea, nblocks); 3031da177e4SLinus Torvalds DXDaddress(ea, blkno); 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* Free up INLINE area */ 3061da177e4SLinus Torvalds if (ji->ea.flag & DXD_INLINE) 3071da177e4SLinus Torvalds ji->mode2 |= INLINEEA; 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds return 0; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds failed: 3121da177e4SLinus Torvalds /* Rollback quota allocation. */ 3135dd4056dSChristoph Hellwig dquot_free_block(ip, nblocks); 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds dbFree(ip, blkno, nblocks); 3161da177e4SLinus Torvalds return rc; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds /* 3201da177e4SLinus Torvalds * NAME: ea_read_inline 3211da177e4SLinus Torvalds * 3221da177e4SLinus Torvalds * FUNCTION: Read an inlined EA into user's buffer 3231da177e4SLinus Torvalds * 3241da177e4SLinus Torvalds * PARAMETERS: 3251da177e4SLinus Torvalds * ip - Inode pointer 3261da177e4SLinus Torvalds * ealist - Pointer to buffer to fill in with EA 3271da177e4SLinus Torvalds * 3281da177e4SLinus Torvalds * RETURNS: 0 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds static int ea_read_inline(struct inode *ip, struct jfs_ea_list *ealist) 3311da177e4SLinus Torvalds { 3321da177e4SLinus Torvalds struct jfs_inode_info *ji = JFS_IP(ip); 3331da177e4SLinus Torvalds int ea_size = sizeDXD(&ji->ea); 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds if (ea_size == 0) { 3361da177e4SLinus Torvalds ealist->size = 0; 3371da177e4SLinus Torvalds return 0; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds /* Sanity Check */ 3411da177e4SLinus Torvalds if ((sizeDXD(&ji->ea) > sizeof (ji->i_inline_ea))) 3421da177e4SLinus Torvalds return -EIO; 3431da177e4SLinus Torvalds if (le32_to_cpu(((struct jfs_ea_list *) &ji->i_inline_ea)->size) 3441da177e4SLinus Torvalds != ea_size) 3451da177e4SLinus Torvalds return -EIO; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds memcpy(ealist, ji->i_inline_ea, ea_size); 3481da177e4SLinus Torvalds return 0; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* 3521da177e4SLinus Torvalds * NAME: ea_read 3531da177e4SLinus Torvalds * 3541da177e4SLinus Torvalds * FUNCTION: copy EA data into user's buffer 3551da177e4SLinus Torvalds * 3561da177e4SLinus Torvalds * PARAMETERS: 3571da177e4SLinus Torvalds * ip - Inode pointer 3581da177e4SLinus Torvalds * ealist - Pointer to buffer to fill in with EA 3591da177e4SLinus Torvalds * 3601da177e4SLinus Torvalds * NOTES: If EA is inline calls ea_read_inline() to copy EA. 3611da177e4SLinus Torvalds * 3621da177e4SLinus Torvalds * RETURNS: 0 for success; other indicates failure 3631da177e4SLinus Torvalds */ 3641da177e4SLinus Torvalds static int ea_read(struct inode *ip, struct jfs_ea_list *ealist) 3651da177e4SLinus Torvalds { 3661da177e4SLinus Torvalds struct super_block *sb = ip->i_sb; 3671da177e4SLinus Torvalds struct jfs_inode_info *ji = JFS_IP(ip); 3681da177e4SLinus Torvalds struct jfs_sb_info *sbi = JFS_SBI(sb); 3691da177e4SLinus Torvalds int nblocks; 3701da177e4SLinus Torvalds s64 blkno; 3711da177e4SLinus Torvalds char *cp = (char *) ealist; 3721da177e4SLinus Torvalds int i; 3731da177e4SLinus Torvalds int nbytes, nb; 3741da177e4SLinus Torvalds s32 bytes_to_read; 3751da177e4SLinus Torvalds struct metapage *mp; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* quick check for in-line EA */ 3781da177e4SLinus Torvalds if (ji->ea.flag & DXD_INLINE) 3791da177e4SLinus Torvalds return ea_read_inline(ip, ealist); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds nbytes = sizeDXD(&ji->ea); 3821da177e4SLinus Torvalds if (!nbytes) { 383eb8630d7SJoe Perches jfs_error(sb, "nbytes is 0\n"); 3841da177e4SLinus Torvalds return -EIO; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * Figure out how many blocks were allocated when this EA list was 3891da177e4SLinus Torvalds * originally written to disk. 3901da177e4SLinus Torvalds */ 3911da177e4SLinus Torvalds nblocks = lengthDXD(&ji->ea) << sbi->l2nbperpage; 3921da177e4SLinus Torvalds blkno = addressDXD(&ji->ea) << sbi->l2nbperpage; 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds /* 3951da177e4SLinus Torvalds * I have found the disk blocks which were originally used to store 3961da177e4SLinus Torvalds * the FEALIST. now i loop over each contiguous block copying the 3971da177e4SLinus Torvalds * data into the buffer. 3981da177e4SLinus Torvalds */ 3991da177e4SLinus Torvalds for (i = 0; i < nblocks; i += sbi->nbperpage) { 4001da177e4SLinus Torvalds /* 4011da177e4SLinus Torvalds * Determine how many bytes for this request, and round up to 4021da177e4SLinus Torvalds * the nearest aggregate block size 4031da177e4SLinus Torvalds */ 4041da177e4SLinus Torvalds nb = min(PSIZE, nbytes); 4051da177e4SLinus Torvalds bytes_to_read = 4061da177e4SLinus Torvalds ((((nb + sb->s_blocksize - 1)) >> sb->s_blocksize_bits)) 4071da177e4SLinus Torvalds << sb->s_blocksize_bits; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds if (!(mp = read_metapage(ip, blkno + i, bytes_to_read, 1))) 4101da177e4SLinus Torvalds return -EIO; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds memcpy(cp, mp->data, nb); 4131da177e4SLinus Torvalds release_metapage(mp); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds cp += PSIZE; 4161da177e4SLinus Torvalds nbytes -= nb; 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds return 0; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* 4231da177e4SLinus Torvalds * NAME: ea_get 4241da177e4SLinus Torvalds * 4251da177e4SLinus Torvalds * FUNCTION: Returns buffer containing existing extended attributes. 4261da177e4SLinus Torvalds * The size of the buffer will be the larger of the existing 4271da177e4SLinus Torvalds * attributes size, or min_size. 4281da177e4SLinus Torvalds * 4291da177e4SLinus Torvalds * The buffer, which may be inlined in the inode or in the 4301da177e4SLinus Torvalds * page cache must be release by calling ea_release or ea_put 4311da177e4SLinus Torvalds * 4321da177e4SLinus Torvalds * PARAMETERS: 4331da177e4SLinus Torvalds * inode - Inode pointer 4341da177e4SLinus Torvalds * ea_buf - Structure to be populated with ealist and its metadata 4351da177e4SLinus Torvalds * min_size- minimum size of buffer to be returned 4361da177e4SLinus Torvalds * 4371da177e4SLinus Torvalds * RETURNS: 0 for success; Other indicates failure 4381da177e4SLinus Torvalds */ 4391da177e4SLinus Torvalds static int ea_get(struct inode *inode, struct ea_buffer *ea_buf, int min_size) 4401da177e4SLinus Torvalds { 4411da177e4SLinus Torvalds struct jfs_inode_info *ji = JFS_IP(inode); 4421da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 4431da177e4SLinus Torvalds int size; 4441da177e4SLinus Torvalds int ea_size = sizeDXD(&ji->ea); 4451da177e4SLinus Torvalds int blocks_needed, current_blocks; 4461da177e4SLinus Torvalds s64 blkno; 4471da177e4SLinus Torvalds int rc; 4481da177e4SLinus Torvalds int quota_allocation = 0; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds /* When fsck.jfs clears a bad ea, it doesn't clear the size */ 4511da177e4SLinus Torvalds if (ji->ea.flag == 0) 4521da177e4SLinus Torvalds ea_size = 0; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds if (ea_size == 0) { 4551da177e4SLinus Torvalds if (min_size == 0) { 4561da177e4SLinus Torvalds ea_buf->flag = 0; 4571da177e4SLinus Torvalds ea_buf->max_size = 0; 4581da177e4SLinus Torvalds ea_buf->xattr = NULL; 4591da177e4SLinus Torvalds return 0; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds if ((min_size <= sizeof (ji->i_inline_ea)) && 4621da177e4SLinus Torvalds (ji->mode2 & INLINEEA)) { 4631da177e4SLinus Torvalds ea_buf->flag = EA_INLINE | EA_NEW; 4641da177e4SLinus Torvalds ea_buf->max_size = sizeof (ji->i_inline_ea); 4651da177e4SLinus Torvalds ea_buf->xattr = (struct jfs_ea_list *) ji->i_inline_ea; 4661da177e4SLinus Torvalds DXDlength(&ea_buf->new_ea, 0); 4671da177e4SLinus Torvalds DXDaddress(&ea_buf->new_ea, 0); 4681da177e4SLinus Torvalds ea_buf->new_ea.flag = DXD_INLINE; 4691da177e4SLinus Torvalds DXDsize(&ea_buf->new_ea, min_size); 4701da177e4SLinus Torvalds return 0; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds current_blocks = 0; 4731da177e4SLinus Torvalds } else if (ji->ea.flag & DXD_INLINE) { 4741da177e4SLinus Torvalds if (min_size <= sizeof (ji->i_inline_ea)) { 4751da177e4SLinus Torvalds ea_buf->flag = EA_INLINE; 4761da177e4SLinus Torvalds ea_buf->max_size = sizeof (ji->i_inline_ea); 4771da177e4SLinus Torvalds ea_buf->xattr = (struct jfs_ea_list *) ji->i_inline_ea; 4781da177e4SLinus Torvalds goto size_check; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds current_blocks = 0; 4811da177e4SLinus Torvalds } else { 4821da177e4SLinus Torvalds if (!(ji->ea.flag & DXD_EXTENT)) { 483eb8630d7SJoe Perches jfs_error(sb, "invalid ea.flag\n"); 4841da177e4SLinus Torvalds return -EIO; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds current_blocks = (ea_size + sb->s_blocksize - 1) >> 4871da177e4SLinus Torvalds sb->s_blocksize_bits; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds size = max(min_size, ea_size); 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds if (size > PSIZE) { 4921da177e4SLinus Torvalds /* 4931da177e4SLinus Torvalds * To keep the rest of the code simple. Allocate a 4941da177e4SLinus Torvalds * contiguous buffer to work with 4951da177e4SLinus Torvalds */ 4961da177e4SLinus Torvalds ea_buf->xattr = kmalloc(size, GFP_KERNEL); 4971da177e4SLinus Torvalds if (ea_buf->xattr == NULL) 4981da177e4SLinus Torvalds return -ENOMEM; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds ea_buf->flag = EA_MALLOC; 5011da177e4SLinus Torvalds ea_buf->max_size = (size + sb->s_blocksize - 1) & 5021da177e4SLinus Torvalds ~(sb->s_blocksize - 1); 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds if (ea_size == 0) 5051da177e4SLinus Torvalds return 0; 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds if ((rc = ea_read(inode, ea_buf->xattr))) { 5081da177e4SLinus Torvalds kfree(ea_buf->xattr); 5091da177e4SLinus Torvalds ea_buf->xattr = NULL; 5101da177e4SLinus Torvalds return rc; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds goto size_check; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds blocks_needed = (min_size + sb->s_blocksize - 1) >> 5151da177e4SLinus Torvalds sb->s_blocksize_bits; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds if (blocks_needed > current_blocks) { 5181da177e4SLinus Torvalds /* Allocate new blocks to quota. */ 5195dd4056dSChristoph Hellwig rc = dquot_alloc_block(inode, blocks_needed); 5205dd4056dSChristoph Hellwig if (rc) 5211da177e4SLinus Torvalds return -EDQUOT; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds quota_allocation = blocks_needed; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds rc = dbAlloc(inode, INOHINT(inode), (s64) blocks_needed, 5261da177e4SLinus Torvalds &blkno); 5271da177e4SLinus Torvalds if (rc) 5281da177e4SLinus Torvalds goto clean_up; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds DXDlength(&ea_buf->new_ea, blocks_needed); 5311da177e4SLinus Torvalds DXDaddress(&ea_buf->new_ea, blkno); 5321da177e4SLinus Torvalds ea_buf->new_ea.flag = DXD_EXTENT; 5331da177e4SLinus Torvalds DXDsize(&ea_buf->new_ea, min_size); 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds ea_buf->flag = EA_EXTENT | EA_NEW; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds ea_buf->mp = get_metapage(inode, blkno, 5381da177e4SLinus Torvalds blocks_needed << sb->s_blocksize_bits, 5391da177e4SLinus Torvalds 1); 5401da177e4SLinus Torvalds if (ea_buf->mp == NULL) { 5411da177e4SLinus Torvalds dbFree(inode, blkno, (s64) blocks_needed); 5421da177e4SLinus Torvalds rc = -EIO; 5431da177e4SLinus Torvalds goto clean_up; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds ea_buf->xattr = ea_buf->mp->data; 5461da177e4SLinus Torvalds ea_buf->max_size = (min_size + sb->s_blocksize - 1) & 5471da177e4SLinus Torvalds ~(sb->s_blocksize - 1); 5481da177e4SLinus Torvalds if (ea_size == 0) 5491da177e4SLinus Torvalds return 0; 5501da177e4SLinus Torvalds if ((rc = ea_read(inode, ea_buf->xattr))) { 5511da177e4SLinus Torvalds discard_metapage(ea_buf->mp); 5521da177e4SLinus Torvalds dbFree(inode, blkno, (s64) blocks_needed); 5531da177e4SLinus Torvalds goto clean_up; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds goto size_check; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds ea_buf->flag = EA_EXTENT; 5581da177e4SLinus Torvalds ea_buf->mp = read_metapage(inode, addressDXD(&ji->ea), 5591da177e4SLinus Torvalds lengthDXD(&ji->ea) << sb->s_blocksize_bits, 5601da177e4SLinus Torvalds 1); 5611da177e4SLinus Torvalds if (ea_buf->mp == NULL) { 5621da177e4SLinus Torvalds rc = -EIO; 5631da177e4SLinus Torvalds goto clean_up; 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds ea_buf->xattr = ea_buf->mp->data; 5661da177e4SLinus Torvalds ea_buf->max_size = (ea_size + sb->s_blocksize - 1) & 5671da177e4SLinus Torvalds ~(sb->s_blocksize - 1); 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds size_check: 5701da177e4SLinus Torvalds if (EALIST_SIZE(ea_buf->xattr) != ea_size) { 5711da177e4SLinus Torvalds printk(KERN_ERR "ea_get: invalid extended attribute\n"); 572288e4d83SDave Kleikamp print_hex_dump(KERN_ERR, "", DUMP_PREFIX_ADDRESS, 16, 1, 573288e4d83SDave Kleikamp ea_buf->xattr, ea_size, 1); 5741da177e4SLinus Torvalds ea_release(inode, ea_buf); 5751da177e4SLinus Torvalds rc = -EIO; 5761da177e4SLinus Torvalds goto clean_up; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds return ea_size; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds clean_up: 5821da177e4SLinus Torvalds /* Rollback quota allocation */ 5831da177e4SLinus Torvalds if (quota_allocation) 5845dd4056dSChristoph Hellwig dquot_free_block(inode, quota_allocation); 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds return (rc); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds static void ea_release(struct inode *inode, struct ea_buffer *ea_buf) 5901da177e4SLinus Torvalds { 5911da177e4SLinus Torvalds if (ea_buf->flag & EA_MALLOC) 5921da177e4SLinus Torvalds kfree(ea_buf->xattr); 5931da177e4SLinus Torvalds else if (ea_buf->flag & EA_EXTENT) { 5941da177e4SLinus Torvalds assert(ea_buf->mp); 5951da177e4SLinus Torvalds release_metapage(ea_buf->mp); 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds if (ea_buf->flag & EA_NEW) 5981da177e4SLinus Torvalds dbFree(inode, addressDXD(&ea_buf->new_ea), 5991da177e4SLinus Torvalds lengthDXD(&ea_buf->new_ea)); 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6034f4b401bSDave Kleikamp static int ea_put(tid_t tid, struct inode *inode, struct ea_buffer *ea_buf, 6044f4b401bSDave Kleikamp int new_size) 6051da177e4SLinus Torvalds { 6061da177e4SLinus Torvalds struct jfs_inode_info *ji = JFS_IP(inode); 6071da177e4SLinus Torvalds unsigned long old_blocks, new_blocks; 6081da177e4SLinus Torvalds int rc = 0; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds if (new_size == 0) { 6111da177e4SLinus Torvalds ea_release(inode, ea_buf); 6121da177e4SLinus Torvalds ea_buf = NULL; 6131da177e4SLinus Torvalds } else if (ea_buf->flag & EA_INLINE) { 6141da177e4SLinus Torvalds assert(new_size <= sizeof (ji->i_inline_ea)); 6151da177e4SLinus Torvalds ji->mode2 &= ~INLINEEA; 6161da177e4SLinus Torvalds ea_buf->new_ea.flag = DXD_INLINE; 6171da177e4SLinus Torvalds DXDsize(&ea_buf->new_ea, new_size); 6181da177e4SLinus Torvalds DXDaddress(&ea_buf->new_ea, 0); 6191da177e4SLinus Torvalds DXDlength(&ea_buf->new_ea, 0); 6201da177e4SLinus Torvalds } else if (ea_buf->flag & EA_MALLOC) { 6211da177e4SLinus Torvalds rc = ea_write(inode, ea_buf->xattr, new_size, &ea_buf->new_ea); 6221da177e4SLinus Torvalds kfree(ea_buf->xattr); 6231da177e4SLinus Torvalds } else if (ea_buf->flag & EA_NEW) { 6241da177e4SLinus Torvalds /* We have already allocated a new dxd */ 6251da177e4SLinus Torvalds flush_metapage(ea_buf->mp); 6261da177e4SLinus Torvalds } else { 6271da177e4SLinus Torvalds /* ->xattr must point to original ea's metapage */ 6281da177e4SLinus Torvalds rc = ea_write(inode, ea_buf->xattr, new_size, &ea_buf->new_ea); 6291da177e4SLinus Torvalds discard_metapage(ea_buf->mp); 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds if (rc) 6321da177e4SLinus Torvalds return rc; 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds old_blocks = new_blocks = 0; 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds if (ji->ea.flag & DXD_EXTENT) { 6371da177e4SLinus Torvalds invalidate_dxd_metapages(inode, ji->ea); 6381da177e4SLinus Torvalds old_blocks = lengthDXD(&ji->ea); 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds if (ea_buf) { 6421da177e4SLinus Torvalds txEA(tid, inode, &ji->ea, &ea_buf->new_ea); 6431da177e4SLinus Torvalds if (ea_buf->new_ea.flag & DXD_EXTENT) { 6441da177e4SLinus Torvalds new_blocks = lengthDXD(&ea_buf->new_ea); 6451da177e4SLinus Torvalds if (ji->ea.flag & DXD_INLINE) 6461da177e4SLinus Torvalds ji->mode2 |= INLINEEA; 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds ji->ea = ea_buf->new_ea; 6491da177e4SLinus Torvalds } else { 6501da177e4SLinus Torvalds txEA(tid, inode, &ji->ea, NULL); 6511da177e4SLinus Torvalds if (ji->ea.flag & DXD_INLINE) 6521da177e4SLinus Torvalds ji->mode2 |= INLINEEA; 6531da177e4SLinus Torvalds ji->ea.flag = 0; 6541da177e4SLinus Torvalds ji->ea.size = 0; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds /* If old blocks exist, they must be removed from quota allocation. */ 6581da177e4SLinus Torvalds if (old_blocks) 6595dd4056dSChristoph Hellwig dquot_free_block(inode, old_blocks); 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds inode->i_ctime = CURRENT_TIME; 6621da177e4SLinus Torvalds 6634f4b401bSDave Kleikamp return 0; 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds 6664f4b401bSDave Kleikamp int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name, 6674f4b401bSDave Kleikamp const void *value, size_t value_len, int flags) 6681da177e4SLinus Torvalds { 6691da177e4SLinus Torvalds struct jfs_ea_list *ealist; 6701da177e4SLinus Torvalds struct jfs_ea *ea, *old_ea = NULL, *next_ea = NULL; 6711da177e4SLinus Torvalds struct ea_buffer ea_buf; 6721da177e4SLinus Torvalds int old_ea_size = 0; 6731da177e4SLinus Torvalds int xattr_size; 6741da177e4SLinus Torvalds int new_size; 6751da177e4SLinus Torvalds int namelen = strlen(name); 6761da177e4SLinus Torvalds int found = 0; 6771da177e4SLinus Torvalds int rc; 6781da177e4SLinus Torvalds int length; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds down_write(&JFS_IP(inode)->xattr_sem); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds xattr_size = ea_get(inode, &ea_buf, 0); 6831da177e4SLinus Torvalds if (xattr_size < 0) { 6841da177e4SLinus Torvalds rc = xattr_size; 6851da177e4SLinus Torvalds goto out; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds again: 6891da177e4SLinus Torvalds ealist = (struct jfs_ea_list *) ea_buf.xattr; 6901da177e4SLinus Torvalds new_size = sizeof (struct jfs_ea_list); 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds if (xattr_size) { 6931da177e4SLinus Torvalds for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); 6941da177e4SLinus Torvalds ea = NEXT_EA(ea)) { 6951da177e4SLinus Torvalds if ((namelen == ea->namelen) && 6961da177e4SLinus Torvalds (memcmp(name, ea->name, namelen) == 0)) { 6971da177e4SLinus Torvalds found = 1; 6981da177e4SLinus Torvalds if (flags & XATTR_CREATE) { 6991da177e4SLinus Torvalds rc = -EEXIST; 7001da177e4SLinus Torvalds goto release; 7011da177e4SLinus Torvalds } 7021da177e4SLinus Torvalds old_ea = ea; 7031da177e4SLinus Torvalds old_ea_size = EA_SIZE(ea); 7041da177e4SLinus Torvalds next_ea = NEXT_EA(ea); 7051da177e4SLinus Torvalds } else 7061da177e4SLinus Torvalds new_size += EA_SIZE(ea); 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds if (!found) { 7111da177e4SLinus Torvalds if (flags & XATTR_REPLACE) { 7121da177e4SLinus Torvalds rc = -ENODATA; 7131da177e4SLinus Torvalds goto release; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds if (value == NULL) { 7161da177e4SLinus Torvalds rc = 0; 7171da177e4SLinus Torvalds goto release; 7181da177e4SLinus Torvalds } 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds if (value) 7211da177e4SLinus Torvalds new_size += sizeof (struct jfs_ea) + namelen + 1 + value_len; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds if (new_size > ea_buf.max_size) { 7241da177e4SLinus Torvalds /* 7251da177e4SLinus Torvalds * We need to allocate more space for merged ea list. 7261da177e4SLinus Torvalds * We should only have loop to again: once. 7271da177e4SLinus Torvalds */ 7281da177e4SLinus Torvalds ea_release(inode, &ea_buf); 7291da177e4SLinus Torvalds xattr_size = ea_get(inode, &ea_buf, new_size); 7301da177e4SLinus Torvalds if (xattr_size < 0) { 7311da177e4SLinus Torvalds rc = xattr_size; 7321da177e4SLinus Torvalds goto out; 7331da177e4SLinus Torvalds } 7341da177e4SLinus Torvalds goto again; 7351da177e4SLinus Torvalds } 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds /* Remove old ea of the same name */ 7381da177e4SLinus Torvalds if (found) { 7391da177e4SLinus Torvalds /* number of bytes following target EA */ 7401da177e4SLinus Torvalds length = (char *) END_EALIST(ealist) - (char *) next_ea; 7411da177e4SLinus Torvalds if (length > 0) 7421da177e4SLinus Torvalds memmove(old_ea, next_ea, length); 7431da177e4SLinus Torvalds xattr_size -= old_ea_size; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* Add new entry to the end */ 7471da177e4SLinus Torvalds if (value) { 7481da177e4SLinus Torvalds if (xattr_size == 0) 7491da177e4SLinus Torvalds /* Completely new ea list */ 7501da177e4SLinus Torvalds xattr_size = sizeof (struct jfs_ea_list); 7511da177e4SLinus Torvalds 7520439e091SJie Liu /* 7530439e091SJie Liu * The size of EA value is limitted by on-disk format up to 7540439e091SJie Liu * __le16, there would be an overflow if the size is equal 7550439e091SJie Liu * to XATTR_SIZE_MAX (65536). In order to avoid this issue, 7560439e091SJie Liu * we can pre-checkup the value size against USHRT_MAX, and 7570439e091SJie Liu * return -E2BIG in this case, which is consistent with the 7580439e091SJie Liu * VFS setxattr interface. 7590439e091SJie Liu */ 7600439e091SJie Liu if (value_len >= USHRT_MAX) { 7610439e091SJie Liu rc = -E2BIG; 7620439e091SJie Liu goto release; 7630439e091SJie Liu } 7640439e091SJie Liu 7651da177e4SLinus Torvalds ea = (struct jfs_ea *) ((char *) ealist + xattr_size); 7661da177e4SLinus Torvalds ea->flag = 0; 7671da177e4SLinus Torvalds ea->namelen = namelen; 7681da177e4SLinus Torvalds ea->valuelen = (cpu_to_le16(value_len)); 7691da177e4SLinus Torvalds memcpy(ea->name, name, namelen); 7701da177e4SLinus Torvalds ea->name[namelen] = 0; 7711da177e4SLinus Torvalds if (value_len) 7721da177e4SLinus Torvalds memcpy(&ea->name[namelen + 1], value, value_len); 7731da177e4SLinus Torvalds xattr_size += EA_SIZE(ea); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /* DEBUG - If we did this right, these number match */ 7771da177e4SLinus Torvalds if (xattr_size != new_size) { 7781da177e4SLinus Torvalds printk(KERN_ERR 7790439e091SJie Liu "__jfs_setxattr: xattr_size = %d, new_size = %d\n", 7801da177e4SLinus Torvalds xattr_size, new_size); 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds rc = -EINVAL; 7831da177e4SLinus Torvalds goto release; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds /* 7871da177e4SLinus Torvalds * If we're left with an empty list, there's no ea 7881da177e4SLinus Torvalds */ 7891da177e4SLinus Torvalds if (new_size == sizeof (struct jfs_ea_list)) 7901da177e4SLinus Torvalds new_size = 0; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds ealist->size = cpu_to_le32(new_size); 7931da177e4SLinus Torvalds 7944f4b401bSDave Kleikamp rc = ea_put(tid, inode, &ea_buf, new_size); 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds goto out; 7971da177e4SLinus Torvalds release: 7981da177e4SLinus Torvalds ea_release(inode, &ea_buf); 7991da177e4SLinus Torvalds out: 8001da177e4SLinus Torvalds up_write(&JFS_IP(inode)->xattr_sem); 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds return rc; 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data, 8061da177e4SLinus Torvalds size_t buf_size) 8071da177e4SLinus Torvalds { 8081da177e4SLinus Torvalds struct jfs_ea_list *ealist; 8091da177e4SLinus Torvalds struct jfs_ea *ea; 8101da177e4SLinus Torvalds struct ea_buffer ea_buf; 8111da177e4SLinus Torvalds int xattr_size; 8121da177e4SLinus Torvalds ssize_t size; 8131da177e4SLinus Torvalds int namelen = strlen(name); 8141da177e4SLinus Torvalds char *value; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds down_read(&JFS_IP(inode)->xattr_sem); 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds xattr_size = ea_get(inode, &ea_buf, 0); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds if (xattr_size < 0) { 8211da177e4SLinus Torvalds size = xattr_size; 8221da177e4SLinus Torvalds goto out; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds if (xattr_size == 0) 8261da177e4SLinus Torvalds goto not_found; 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds ealist = (struct jfs_ea_list *) ea_buf.xattr; 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds /* Find the named attribute */ 8311da177e4SLinus Torvalds for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) 8321da177e4SLinus Torvalds if ((namelen == ea->namelen) && 8331da177e4SLinus Torvalds memcmp(name, ea->name, namelen) == 0) { 8341da177e4SLinus Torvalds /* Found it */ 8351da177e4SLinus Torvalds size = le16_to_cpu(ea->valuelen); 8361da177e4SLinus Torvalds if (!data) 8371da177e4SLinus Torvalds goto release; 8381da177e4SLinus Torvalds else if (size > buf_size) { 8391da177e4SLinus Torvalds size = -ERANGE; 8401da177e4SLinus Torvalds goto release; 8411da177e4SLinus Torvalds } 8421da177e4SLinus Torvalds value = ((char *) &ea->name) + ea->namelen + 1; 8431da177e4SLinus Torvalds memcpy(data, value, size); 8441da177e4SLinus Torvalds goto release; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds not_found: 8471da177e4SLinus Torvalds size = -ENODATA; 8481da177e4SLinus Torvalds release: 8491da177e4SLinus Torvalds ea_release(inode, &ea_buf); 8501da177e4SLinus Torvalds out: 8511da177e4SLinus Torvalds up_read(&JFS_IP(inode)->xattr_sem); 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds return size; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds /* 8571da177e4SLinus Torvalds * No special permissions are needed to list attributes except for trusted.* 8581da177e4SLinus Torvalds */ 8591da177e4SLinus Torvalds static inline int can_list(struct jfs_ea *ea) 8601da177e4SLinus Torvalds { 8611da177e4SLinus Torvalds return (strncmp(ea->name, XATTR_TRUSTED_PREFIX, 8621da177e4SLinus Torvalds XATTR_TRUSTED_PREFIX_LEN) || 8631da177e4SLinus Torvalds capable(CAP_SYS_ADMIN)); 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size) 8671da177e4SLinus Torvalds { 8682b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 8691da177e4SLinus Torvalds char *buffer; 8701da177e4SLinus Torvalds ssize_t size = 0; 8711da177e4SLinus Torvalds int xattr_size; 8721da177e4SLinus Torvalds struct jfs_ea_list *ealist; 8731da177e4SLinus Torvalds struct jfs_ea *ea; 8741da177e4SLinus Torvalds struct ea_buffer ea_buf; 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds down_read(&JFS_IP(inode)->xattr_sem); 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds xattr_size = ea_get(inode, &ea_buf, 0); 8791da177e4SLinus Torvalds if (xattr_size < 0) { 8801da177e4SLinus Torvalds size = xattr_size; 8811da177e4SLinus Torvalds goto out; 8821da177e4SLinus Torvalds } 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds if (xattr_size == 0) 8851da177e4SLinus Torvalds goto release; 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds ealist = (struct jfs_ea_list *) ea_buf.xattr; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds /* compute required size of list */ 8901da177e4SLinus Torvalds for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) { 8911da177e4SLinus Torvalds if (can_list(ea)) 8921da177e4SLinus Torvalds size += name_size(ea) + 1; 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds if (!data) 8961da177e4SLinus Torvalds goto release; 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds if (size > buf_size) { 8991da177e4SLinus Torvalds size = -ERANGE; 9001da177e4SLinus Torvalds goto release; 9011da177e4SLinus Torvalds } 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds /* Copy attribute names to buffer */ 9041da177e4SLinus Torvalds buffer = data; 9051da177e4SLinus Torvalds for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) { 9061da177e4SLinus Torvalds if (can_list(ea)) { 9071da177e4SLinus Torvalds int namelen = copy_name(buffer, ea); 9081da177e4SLinus Torvalds buffer += namelen + 1; 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds } 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds release: 9131da177e4SLinus Torvalds ea_release(inode, &ea_buf); 9141da177e4SLinus Torvalds out: 9151da177e4SLinus Torvalds up_read(&JFS_IP(inode)->xattr_sem); 9161da177e4SLinus Torvalds return size; 9171da177e4SLinus Torvalds } 9181da177e4SLinus Torvalds 919c8b6056aSAndreas Gruenbacher static int __jfs_xattr_set(struct inode *inode, const char *name, 920c8b6056aSAndreas Gruenbacher const void *value, size_t size, int flags) 9211da177e4SLinus Torvalds { 9224f4b401bSDave Kleikamp struct jfs_inode_info *ji = JFS_IP(inode); 9234f4b401bSDave Kleikamp tid_t tid; 924c8b6056aSAndreas Gruenbacher int rc; 925c18f7b51SDave Kleikamp 9264f4b401bSDave Kleikamp tid = txBegin(inode->i_sb, 0); 9271de87444SIngo Molnar mutex_lock(&ji->commit_mutex); 928c8b6056aSAndreas Gruenbacher rc = __jfs_setxattr(tid, inode, name, value, size, flags); 9294f4b401bSDave Kleikamp if (!rc) 9304f4b401bSDave Kleikamp rc = txCommit(tid, 1, &inode, 0); 9314f4b401bSDave Kleikamp txEnd(tid); 9321de87444SIngo Molnar mutex_unlock(&ji->commit_mutex); 9334f4b401bSDave Kleikamp 9344f4b401bSDave Kleikamp return rc; 9351da177e4SLinus Torvalds } 9361d15b10fSDave Kleikamp 937c8b6056aSAndreas Gruenbacher static int jfs_xattr_get(const struct xattr_handler *handler, 938c8b6056aSAndreas Gruenbacher struct dentry *unused, struct inode *inode, 939c8b6056aSAndreas Gruenbacher const char *name, void *value, size_t size) 940c8b6056aSAndreas Gruenbacher { 941c8b6056aSAndreas Gruenbacher name = xattr_full_name(handler, name); 942c8b6056aSAndreas Gruenbacher return __jfs_getxattr(inode, name, value, size); 943c8b6056aSAndreas Gruenbacher } 944c8b6056aSAndreas Gruenbacher 945c8b6056aSAndreas Gruenbacher static int jfs_xattr_set(const struct xattr_handler *handler, 946c8b6056aSAndreas Gruenbacher struct dentry *dentry, const char *name, 947c8b6056aSAndreas Gruenbacher const void *value, size_t size, int flags) 948c8b6056aSAndreas Gruenbacher { 949c8b6056aSAndreas Gruenbacher struct inode *inode = d_inode(dentry); 950c8b6056aSAndreas Gruenbacher 951c8b6056aSAndreas Gruenbacher name = xattr_full_name(handler, name); 952c8b6056aSAndreas Gruenbacher return __jfs_xattr_set(inode, name, value, size, flags); 953c8b6056aSAndreas Gruenbacher } 954c8b6056aSAndreas Gruenbacher 955c8b6056aSAndreas Gruenbacher static int jfs_xattr_get_os2(const struct xattr_handler *handler, 956c8b6056aSAndreas Gruenbacher struct dentry *unused, struct inode *inode, 957c8b6056aSAndreas Gruenbacher const char *name, void *value, size_t size) 958c8b6056aSAndreas Gruenbacher { 959c8b6056aSAndreas Gruenbacher if (is_known_namespace(name)) 960c8b6056aSAndreas Gruenbacher return -EOPNOTSUPP; 961c8b6056aSAndreas Gruenbacher return __jfs_getxattr(inode, name, value, size); 962c8b6056aSAndreas Gruenbacher } 963c8b6056aSAndreas Gruenbacher 964c8b6056aSAndreas Gruenbacher static int jfs_xattr_set_os2(const struct xattr_handler *handler, 965c8b6056aSAndreas Gruenbacher struct dentry *dentry, const char *name, 966c8b6056aSAndreas Gruenbacher const void *value, size_t size, int flags) 967c8b6056aSAndreas Gruenbacher { 968c8b6056aSAndreas Gruenbacher struct inode *inode = d_inode(dentry); 969c8b6056aSAndreas Gruenbacher 970c8b6056aSAndreas Gruenbacher if (is_known_namespace(name)) 971c8b6056aSAndreas Gruenbacher return -EOPNOTSUPP; 972c8b6056aSAndreas Gruenbacher return __jfs_xattr_set(inode, name, value, size, flags); 973c8b6056aSAndreas Gruenbacher } 974c8b6056aSAndreas Gruenbacher 975c8b6056aSAndreas Gruenbacher static const struct xattr_handler jfs_user_xattr_handler = { 976c8b6056aSAndreas Gruenbacher .prefix = XATTR_USER_PREFIX, 977c8b6056aSAndreas Gruenbacher .get = jfs_xattr_get, 978c8b6056aSAndreas Gruenbacher .set = jfs_xattr_set, 979c8b6056aSAndreas Gruenbacher }; 980c8b6056aSAndreas Gruenbacher 981c8b6056aSAndreas Gruenbacher static const struct xattr_handler jfs_os2_xattr_handler = { 982c8b6056aSAndreas Gruenbacher .prefix = XATTR_OS2_PREFIX, 983c8b6056aSAndreas Gruenbacher .get = jfs_xattr_get_os2, 984c8b6056aSAndreas Gruenbacher .set = jfs_xattr_set_os2, 985c8b6056aSAndreas Gruenbacher }; 986c8b6056aSAndreas Gruenbacher 987c8b6056aSAndreas Gruenbacher static const struct xattr_handler jfs_security_xattr_handler = { 988c8b6056aSAndreas Gruenbacher .prefix = XATTR_SECURITY_PREFIX, 989c8b6056aSAndreas Gruenbacher .get = jfs_xattr_get, 990c8b6056aSAndreas Gruenbacher .set = jfs_xattr_set, 991c8b6056aSAndreas Gruenbacher }; 992c8b6056aSAndreas Gruenbacher 993c8b6056aSAndreas Gruenbacher static const struct xattr_handler jfs_trusted_xattr_handler = { 994c8b6056aSAndreas Gruenbacher .prefix = XATTR_TRUSTED_PREFIX, 995c8b6056aSAndreas Gruenbacher .get = jfs_xattr_get, 996c8b6056aSAndreas Gruenbacher .set = jfs_xattr_set, 997c8b6056aSAndreas Gruenbacher }; 998c8b6056aSAndreas Gruenbacher 9992cc6a5a0SChristoph Hellwig const struct xattr_handler *jfs_xattr_handlers[] = { 1000c18f7b51SDave Kleikamp #ifdef CONFIG_JFS_POSIX_ACL 10012cc6a5a0SChristoph Hellwig &posix_acl_access_xattr_handler, 10022cc6a5a0SChristoph Hellwig &posix_acl_default_xattr_handler, 10032cc6a5a0SChristoph Hellwig #endif 1004c8b6056aSAndreas Gruenbacher &jfs_os2_xattr_handler, 1005c8b6056aSAndreas Gruenbacher &jfs_user_xattr_handler, 1006c8b6056aSAndreas Gruenbacher &jfs_security_xattr_handler, 1007c8b6056aSAndreas Gruenbacher &jfs_trusted_xattr_handler, 10082cc6a5a0SChristoph Hellwig NULL, 10092cc6a5a0SChristoph Hellwig }; 10102cc6a5a0SChristoph Hellwig 10112cc6a5a0SChristoph Hellwig 10121d15b10fSDave Kleikamp #ifdef CONFIG_JFS_SECURITY 101321d1101fSDave Kleikamp static int jfs_initxattrs(struct inode *inode, const struct xattr *xattr_array, 10149d8f13baSMimi Zohar void *fs_info) 10159d8f13baSMimi Zohar { 10169d8f13baSMimi Zohar const struct xattr *xattr; 10179d8f13baSMimi Zohar tid_t *tid = fs_info; 10189d8f13baSMimi Zohar char *name; 10199d8f13baSMimi Zohar int err = 0; 10209d8f13baSMimi Zohar 10219d8f13baSMimi Zohar for (xattr = xattr_array; xattr->name != NULL; xattr++) { 10229d8f13baSMimi Zohar name = kmalloc(XATTR_SECURITY_PREFIX_LEN + 10239d8f13baSMimi Zohar strlen(xattr->name) + 1, GFP_NOFS); 10249d8f13baSMimi Zohar if (!name) { 10259d8f13baSMimi Zohar err = -ENOMEM; 10269d8f13baSMimi Zohar break; 10279d8f13baSMimi Zohar } 10289d8f13baSMimi Zohar strcpy(name, XATTR_SECURITY_PREFIX); 10299d8f13baSMimi Zohar strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name); 10309d8f13baSMimi Zohar 10319d8f13baSMimi Zohar err = __jfs_setxattr(*tid, inode, name, 10329d8f13baSMimi Zohar xattr->value, xattr->value_len, 0); 10339d8f13baSMimi Zohar kfree(name); 10349d8f13baSMimi Zohar if (err < 0) 10359d8f13baSMimi Zohar break; 10369d8f13baSMimi Zohar } 10379d8f13baSMimi Zohar return err; 10389d8f13baSMimi Zohar } 10399d8f13baSMimi Zohar 10402a7dba39SEric Paris int jfs_init_security(tid_t tid, struct inode *inode, struct inode *dir, 10412a7dba39SEric Paris const struct qstr *qstr) 10421d15b10fSDave Kleikamp { 10439d8f13baSMimi Zohar return security_inode_init_security(inode, dir, qstr, 10449d8f13baSMimi Zohar &jfs_initxattrs, &tid); 10451d15b10fSDave Kleikamp } 10461d15b10fSDave Kleikamp #endif 1047