cregit-Linux how code gets into the kernel

Release 4.18 fs/reiserfs/xattr.c

Directory: fs/reiserfs
// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/reiserfs/xattr.c
 *
 * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com>
 *
 */

/*
 * In order to implement EA/ACLs in a clean, backwards compatible manner,
 * they are implemented as files in a "private" directory.
 * Each EA is in it's own file, with the directory layout like so (/ is assumed
 * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory,
 * directories named using the capital-hex form of the objectid and
 * generation number are used. Inside each directory are individual files
 * named with the name of the extended attribute.
 *
 * So, for objectid 12648430, we could have:
 * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access
 * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default
 * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type
 * .. or similar.
 *
 * The file contents are the text of the EA. The size is known based on the
 * stat data describing the file.
 *
 * In the case of system.posix_acl_access and system.posix_acl_default, since
 * these are special cases for filesystem ACLs, they are interpreted by the
 * kernel, in addition, they are negatively and positively cached and attached
 * to the inode so that unnecessary lookups are avoided.
 *
 * Locking works like so:
 * Directory components (xattr root, xattr dir) are protectd by their i_mutex.
 * The xattrs themselves are protected by the xattr_sem.
 */

#include "reiserfs.h"
#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include "xattr.h"
#include "acl.h"
#include <linux/uaccess.h>
#include <net/checksum.h>
#include <linux/stat.h>
#include <linux/quotaops.h>
#include <linux/security.h>
#include <linux/posix_acl_xattr.h>


#define PRIVROOT_NAME ".reiserfs_priv"

#define XAROOT_NAME   "xattrs"


/*
 * Helpers for inode ops. We do this so that we don't have all the VFS
 * overhead and also for proper i_mutex annotation.
 * dir->i_mutex must be held for all of them.
 */
#ifdef CONFIG_REISERFS_FS_XATTR

static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) { BUG_ON(!inode_is_locked(dir)); return dir->i_op->create(dir, dentry, mode, true); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney2556.82%240.00%
Andrew Morton1738.64%120.00%
Al Viro24.55%240.00%
Total44100.00%5100.00%

#endif
static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) { BUG_ON(!inode_is_locked(dir)); return dir->i_op->mkdir(dir, dentry, mode); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney2866.67%125.00%
Andrew Morton1228.57%125.00%
Al Viro24.76%250.00%
Total42100.00%4100.00%

/* * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr * mutation ops aren't called during rename or splace, which are the * only other users of I_MUTEX_CHILD. It violates the ordering, but that's * better than allocating another subclass just for this code. */
static int xattr_unlink(struct inode *dir, struct dentry *dentry) { int error; BUG_ON(!inode_is_locked(dir)); inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); error = dir->i_op->unlink(dir, dentry); inode_unlock(d_inode(dentry)); if (!error) d_delete(dentry); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton3244.44%125.00%
Jeff Mahoney3143.06%125.00%
David Howells68.33%125.00%
Al Viro34.17%125.00%
Total72100.00%4100.00%


static int xattr_rmdir(struct inode *dir, struct dentry *dentry) { int error; BUG_ON(!inode_is_locked(dir)); inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); error = dir->i_op->rmdir(dir, dentry); if (!error) d_inode(dentry)->i_flags |= S_DEAD; inode_unlock(d_inode(dentry)); if (!error) d_delete(dentry); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney5159.30%240.00%
Andrew Morton2326.74%120.00%
David Howells910.47%120.00%
Al Viro33.49%120.00%
Total86100.00%5100.00%

#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
static struct dentry *open_xa_root(struct super_block *sb, int flags) { struct dentry *privroot = REISERFS_SB(sb)->priv_root; struct dentry *xaroot; if (d_really_is_negative(privroot)) return ERR_PTR(-ENODATA); inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR); xaroot = dget(REISERFS_SB(sb)->xattr_root); if (!xaroot) xaroot = ERR_PTR(-ENODATA); else if (d_really_is_negative(xaroot)) { int err = -ENODATA; if (xattr_may_create(flags)) err = xattr_mkdir(d_inode(privroot), xaroot, 0700); if (err) { dput(xaroot); xaroot = ERR_PTR(err); } } inode_unlock(d_inode(privroot)); return xaroot; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney7147.97%666.67%
Andrew Morton6040.54%111.11%
David Howells1510.14%111.11%
Al Viro21.35%111.11%
Total148100.00%9100.00%


static struct dentry *open_xa_dir(const struct inode *inode, int flags) { struct dentry *xaroot, *xadir; char namebuf[17]; xaroot = open_xa_root(inode->i_sb, flags); if (IS_ERR(xaroot)) return xaroot; snprintf(namebuf, sizeof(namebuf), "%X.%X", le32_to_cpu(INODE_PKEY(inode)->k_objectid), inode->i_generation); inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR); xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); if (!IS_ERR(xadir) && d_really_is_negative(xadir)) { int err = -ENODATA; if (xattr_may_create(flags)) err = xattr_mkdir(d_inode(xaroot), xadir, 0700); if (err) { dput(xadir); xadir = ERR_PTR(err); } } inode_unlock(d_inode(xaroot)); dput(xaroot); return xadir; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney10961.24%240.00%
Andrew Morton5530.90%120.00%
David Howells126.74%120.00%
Al Viro21.12%120.00%
Total178100.00%5100.00%

/* * The following are side effects of other operations that aren't explicitly * modifying extended attributes. This includes operations such as permissions * or ownership changes, object deletions, etc. */ struct reiserfs_dentry_buf { struct dir_context ctx; struct dentry *xadir; int count; struct dentry *dentries[8]; };
static int fill_with_dentries(struct dir_context *ctx, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { struct reiserfs_dentry_buf *dbuf = container_of(ctx, struct reiserfs_dentry_buf, ctx); struct dentry *dentry; WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir))); if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) return -ENOSPC; if (name[0] == '.' && (namelen < 2 || (namelen == 2 && name[1] == '.'))) return 0; dentry = lookup_one_len(name, dbuf->xadir, namelen); if (IS_ERR(dentry)) { return PTR_ERR(dentry); } else if (d_really_is_negative(dentry)) { /* A directory entry exists, but no file? */ reiserfs_error(dentry->d_sb, "xattr-20003", "Corrupted directory: xattr %pd listed but " "not found for file %pd.\n", dentry, dbuf->xadir); dput(dentry); return -EIO; } dbuf->dentries[dbuf->count++] = dentry; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney10253.12%545.45%
Andrew Morton6232.29%19.09%
Miklos Szeredi126.25%19.09%
Jan Kara73.65%19.09%
David Howells63.12%19.09%
Al Viro31.56%218.18%
Total192100.00%11100.00%


static void cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) { int i; for (i = 0; i < buf->count; i++) if (buf->dentries[i]) dput(buf->dentries[i]); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney3981.25%375.00%
Andrew Morton918.75%125.00%
Total48100.00%4100.00%


static int reiserfs_for_each_xattr(struct inode *inode, int (*action)(struct dentry *, void *), void *data) { struct dentry *dir; int i, err = 0; struct reiserfs_dentry_buf buf = { .ctx.actor = fill_with_dentries, }; /* Skip out, an xattr has no xattrs associated with it */ if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) return 0; dir = open_xa_dir(inode, XATTR_REPLACE); if (IS_ERR(dir)) { err = PTR_ERR(dir); goto out; } else if (d_really_is_negative(dir)) { err = 0; goto out_dir; } inode_lock_nested(d_inode(dir), I_MUTEX_XATTR); buf.xadir = dir; while (1) { err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); if (err) break; if (!buf.count) break; for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { struct dentry *dentry = buf.dentries[i]; if (!d_is_dir(dentry)) err = action(dentry, data); dput(dentry); buf.dentries[i] = NULL; } if (err) break; buf.count = 0; } inode_unlock(d_inode(dir)); cleanup_dentry_buf(&buf); if (!err) { /* * We start a transaction here to avoid a ABBA situation * between the xattr root's i_mutex and the journal lock. * This doesn't incur much additional overhead since the * new transaction will just nest inside the * outer transaction. */ int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); struct reiserfs_transaction_handle th; reiserfs_write_lock(inode->i_sb); err = journal_begin(&th, inode->i_sb, blocks); reiserfs_write_unlock(inode->i_sb); if (!err) { int jerror; inode_lock_nested(d_inode(dir->d_parent), I_MUTEX_XATTR); err = action(dir, data); reiserfs_write_lock(inode->i_sb); jerror = journal_end(&th); reiserfs_write_unlock(inode->i_sb); inode_unlock(d_inode(dir->d_parent)); err = jerror ?: err; } } out_dir: dput(dir); out: /* -ENODATA isn't an error */ if (err == -ENODATA) err = 0; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney25862.32%541.67%
Andrew Morton10324.88%18.33%
Al Viro337.97%325.00%
David Howells194.59%216.67%
Ingo Molnar10.24%18.33%
Total414100.00%12100.00%


static int delete_one_xattr(struct dentry *dentry, void *data) { struct inode *dir = d_inode(dentry->d_parent); /* This is the xattr dir, handle specially. */ if (d_is_dir(dentry)) return xattr_rmdir(dir, dentry); return xattr_unlink(dir, dentry); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney2447.06%125.00%
Andrew Morton2345.10%125.00%
David Howells47.84%250.00%
Total51100.00%4100.00%


static int chown_one_xattr(struct dentry *dentry, void *data) { struct iattr *attrs = data; int ia_valid = attrs->ia_valid; int err; /* * We only want the ownership bits. Otherwise, we'll do * things like change a directory to a regular file if * ATTR_MODE is set. */ attrs->ia_valid &= (ATTR_UID|ATTR_GID); err = reiserfs_setattr(dentry, attrs); attrs->ia_valid = ia_valid; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney5081.97%266.67%
Andrew Morton1118.03%133.33%
Total61100.00%3100.00%

/* No i_mutex, but the inode is unconnected. */
int reiserfs_delete_xattrs(struct inode *inode) { int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); if (err) reiserfs_warning(inode->i_sb, "jdm-20004", "Couldn't delete all xattrs (%d)\n", err); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney3788.10%150.00%
Vladimir V. Saveliev511.90%150.00%
Total42100.00%2100.00%

/* inode->i_mutex: down */
int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) { int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); if (err) reiserfs_warning(inode->i_sb, "jdm-20007", "Couldn't chown all xattrs (%d)\n", err); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney3574.47%250.00%
Vladimir V. Saveliev817.02%125.00%
Andrew Morton48.51%125.00%
Total47100.00%4100.00%

#ifdef CONFIG_REISERFS_FS_XATTR /* * Returns a dentry corresponding to a specific extended attribute file * for the inode. If flags allow, the file is created. Otherwise, a * valid or negative dentry, or an error is returned. */
static struct dentry *xattr_lookup(struct inode *inode, const char *name, int flags) { struct dentry *xadir, *xafile; int err = 0; xadir = open_xa_dir(inode, flags); if (IS_ERR(xadir)) return ERR_CAST(xadir); inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR); xafile = lookup_one_len(name, xadir, strlen(name)); if (IS_ERR(xafile)) { err = PTR_ERR(xafile); goto out; } if (d_really_is_positive(xafile) && (flags & XATTR_CREATE)) err = -EEXIST; if (d_really_is_negative(xafile)) { err = -ENODATA; if (xattr_may_create(flags)) err = xattr_create(d_inode(xadir), xafile, 0700|S_IFREG); } if (err) dput(xafile); out: inode_unlock(d_inode(xadir)); dput(xadir); if (err) return ERR_PTR(err); return xafile; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton10353.93%114.29%
Jeff Mahoney7137.17%457.14%
David Howells157.85%114.29%
Al Viro21.05%114.29%
Total191100.00%7100.00%

/* Internal operations on file data */
static inline void reiserfs_put_page(struct page *page) { kunmap(page); put_page(page); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney1986.36%133.33%
Andrew Morton29.09%133.33%
Kirill A. Shutemov14.55%133.33%
Total22100.00%3100.00%


static struct page *reiserfs_get_page(struct inode *dir, size_t n) { struct address_space *mapping = dir->i_mapping; struct page *page; /* * We can deadlock if we try to free dentries, * and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ mapping_set_gfp_mask(mapping, GFP_NOFS); page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL); if (!IS_ERR(page)) { kmap(page); if (PageError(page)) goto fail; } return page; fail: reiserfs_put_page(page); return ERR_PTR(-EIO); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney5053.76%250.00%
Andrew Morton4245.16%125.00%
Kirill A. Shutemov11.08%125.00%
Total93100.00%4100.00%


static inline __u32 xattr_hash(const char *msg, int len) { return csum_partial(msg, len, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton1664.00%150.00%
Jeff Mahoney936.00%150.00%
Total25100.00%2100.00%

int reiserfs_commit_write(struct file *f, struct page *page, unsigned from, unsigned to);
static void update_ctime(struct inode *inode) { struct timespec64 now = current_time(inode); if (inode_unhashed(inode) || !inode->i_nlink || timespec64_equal(&inode->i_ctime, &now)) return; inode->i_ctime = current_time(inode); mark_inode_dirty(inode); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney3051.72%120.00%
Andrew Morton2034.48%120.00%
Deepa Dinamani712.07%240.00%
Al Viro11.72%120.00%
Total58100.00%5100.00%


static int lookup_and_delete_xattr(struct inode *inode, const char *name) { int err = 0; struct dentry *dentry, *xadir; xadir = open_xa_dir(inode, XATTR_REPLACE); if (IS_ERR(xadir)) return PTR_ERR(xadir); inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR); dentry = lookup_one_len(name, xadir, strlen(name)); if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_dput; } if (d_really_is_positive(dentry)) { err = xattr_unlink(d_inode(xadir), dentry); update_ctime(inode); } dput(dentry); out_dput: inode_unlock(d_inode(xadir)); dput(xadir); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney10271.33%457.14%
Andrew Morton2718.88%114.29%
David Howells128.39%114.29%
Al Viro21.40%114.29%
Total143100.00%7100.00%

/* Generic extended attribute operations that can be used by xa plugins */ /* * inode->i_mutex: down */
int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, struct inode *inode, const char *name, const void *buffer, size_t buffer_size, int flags) { int err = 0; struct dentry *dentry; struct page *page; char *data; size_t file_pos = 0; size_t buffer_pos = 0; size_t new_size; __u32 xahash = 0; if (get_inode_sd_version(inode) == STAT_DATA_V1) return -EOPNOTSUPP; if (!buffer) { err = lookup_and_delete_xattr(inode, name); return err; } dentry = xattr_lookup(inode, name, flags); if (IS_ERR(dentry)) return PTR_ERR(dentry); down_write(&REISERFS_I(inode)->i_xattr_sem); xahash = xattr_hash(buffer, buffer_size); while (buffer_pos < buffer_size || buffer_pos == 0) { size_t chunk; size_t skip = 0; size_t page_offset = (file_pos & (PAGE_SIZE - 1)); if (buffer_size - buffer_pos > PAGE_SIZE) chunk = PAGE_SIZE; else chunk = buffer_size - buffer_pos; page = reiserfs_get_page(d_inode(dentry), file_pos); if (IS_ERR(page)) { err = PTR_ERR(page); goto out_unlock; } lock_page(page); data = page_address(page); if (file_pos == 0) { struct reiserfs_xattr_header *rxh; skip = file_pos = sizeof(struct reiserfs_xattr_header); if (chunk + skip > PAGE_SIZE) chunk = PAGE_SIZE - skip; rxh = (struct reiserfs_xattr_header *)data; rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); rxh->h_hash = cpu_to_le32(xahash); } reiserfs_write_lock(inode->i_sb); err = __reiserfs_write_begin(page, page_offset, chunk + skip); if (!err) { if (buffer) memcpy(data + skip, buffer + buffer_pos, chunk); err = reiserfs_commit_write(NULL, page, page_offset, page_offset + chunk + skip); } reiserfs_write_unlock(inode->i_sb); unlock_page(page); reiserfs_put_page(page); buffer_pos += chunk; file_pos += chunk; skip = 0; if (err || buffer_size == 0 || !buffer) break; } new_size = buffer_size + sizeof(struct reiserfs_xattr_header); if (!err && new_size < i_size_read(d_inode(dentry))) { struct iattr newattrs = { .ia_ctime = current_time(inode), .ia_size = new_size, .ia_valid = ATTR_SIZE | ATTR_CTIME, }; inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR); inode_dio_wait(d_inode(dentry)); err = reiserfs_setattr(dentry, &newattrs); inode_unlock(d_inode(dentry)); } else update_ctime(inode); out_unlock: up_write(&REISERFS_I(inode)->i_xattr_sem); dput(dentry); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton26250.29%315.79%
Jeff Mahoney22543.19%842.11%
David Howells152.88%15.26%
Frédéric Weisbecker91.73%210.53%
Kirill A. Shutemov50.96%15.26%
Al Viro20.38%15.26%
Christoph Hellwig20.38%210.53%
Deepa Dinamani10.19%15.26%
Total521100.00%19100.00%

/* We need to start a transaction to maintain lock ordering */
int reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer, size_t buffer_size, int flags) { struct reiserfs_transaction_handle th; int error, error2; size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); if (!(flags & XATTR_REPLACE)) jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); reiserfs_write_lock(inode->i_sb); error = journal_begin(&th, inode->i_sb, jbegin_count); reiserfs_write_unlock(inode->i_sb); if (error) { return error; } error = reiserfs_xattr_set_handle(&th, inode, name, buffer, buffer_size, flags); reiserfs_write_lock(inode->i_sb); error2 = journal_end(&th); reiserfs_write_unlock(inode->i_sb); if (error == 0) error = error2; return error; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney8656.95%457.14%
Andrew Morton6442.38%228.57%
Linus Torvalds10.66%114.29%
Total151100.00%7100.00%

/* * inode->i_mutex: down */
int reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, size_t buffer_size) { ssize_t err = 0; struct dentry *dentry; size_t isize; size_t file_pos = 0; size_t buffer_pos = 0; struct page *page; __u32 hash = 0; if (name == NULL) return -EINVAL; /* * We can't have xattrs attached to v1 items since they don't have * generation numbers */ if (get_inode_sd_version(inode) == STAT_DATA_V1) return -EOPNOTSUPP; dentry = xattr_lookup(inode, name, XATTR_REPLACE); if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out; } down_read(&REISERFS_I(inode)->i_xattr_sem); isize = i_size_read(d_inode(dentry)); /* Just return the size needed */ if (buffer == NULL) { err = isize - sizeof(struct reiserfs_xattr_header); goto out_unlock; } if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { err = -ERANGE; goto out_unlock; } while (file_pos < isize) { size_t chunk; char *data; size_t skip = 0; if (isize - file_pos > PAGE_SIZE) chunk = PAGE_SIZE; else chunk = isize - file_pos; page = reiserfs_get_page(d_inode(dentry), file_pos); if (IS_ERR(page)) { err = PTR_ERR(page); goto out_unlock; } lock_page(page); data = page_address(page); if (file_pos == 0) { struct reiserfs_xattr_header *rxh = (struct reiserfs_xattr_header *)data; skip = file_pos = sizeof(struct reiserfs_xattr_header); chunk -= skip; /* Magic doesn't match up.. */ if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { unlock_page(page); reiserfs_put_page(page); reiserfs_warning(inode->i_sb, "jdm-20001", "Invalid magic for xattr (%s) " "associated with %k", name, INODE_PKEY(inode)); err = -EIO; goto out_unlock; } hash = le32_to_cpu(rxh->h_hash); } memcpy(buffer + buffer_pos, data + skip, chunk); unlock_page(page); reiserfs_put_page(page); file_pos += chunk; buffer_pos += chunk; skip = 0; } err = isize - sizeof(struct reiserfs_xattr_header); if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != hash) { reiserfs_warning(inode->i_sb, "jdm-20002", "Invalid hash for xattr (%s) associated " "with %k", name, INODE_PKEY(inode)); err = -EIO; } out_unlock: up_read(&REISERFS_I(inode)->i_xattr_sem); dput(dentry); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney32770.93%770.00%
Andrew Morton12627.33%110.00%
David Howells61.30%110.00%
Kirill A. Shutemov20.43%110.00%
Total461100.00%10100.00%

/* * In order to implement different sets of xattr operations for each xattr * prefix with the generic xattr API, a filesystem should create a * null-terminated array of struct xattr_handler (one for each prefix) and * hang a pointer to it off of the s_xattr field of the superblock. * * The generic_fooxattr() functions will use this list to dispatch xattr * operations to the correct xattr_handler. */ #define for_each_xattr_handler(handlers, handler) \ for ((handler) = *(handlers)++; \ (handler) != NULL; \ (handler) = *(handlers)++) /* This is the implementation for the xattr plugin infrastructure */
static inline const struct xattr_handler * find_xattr_handler_prefix(const struct xattr_handler **handlers, const char *name) { const struct xattr_handler *xah; if (!handlers) return NULL; for_each_xattr_handler(handlers, xah) { const char *prefix = xattr_prefix(xah); if (strncmp(prefix, name, strlen(prefix)) == 0) break; } return xah; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney4966.22%350.00%
Andrew Morton1216.22%116.67%
Andreas Gruenbacher1013.51%116.67%
Stephen Hemminger34.05%116.67%
Total74100.00%6100.00%

struct listxattr_buf { struct dir_context ctx; size_t size; size_t pos; char *buf; struct dentry *dentry; };
static int listxattr_filler(struct dir_context *ctx, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { struct listxattr_buf *b = container_of(ctx, struct listxattr_buf, ctx); size_t size; if (name[0] != '.' || (namelen != 1 && (name[1] != '.' || namelen != 2))) { const struct xattr_handler *handler; handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, name); if (!handler /* Unsupported xattr name */ || (handler->list && !handler->list(b->dentry))) return 0; size = namelen + 1; if (b->buf) { if (size > b->size) return -ERANGE; memcpy(b->buf + b->pos, name, namelen); b->buf[b->pos + namelen] = 0; } b->pos += size; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton9953.23%114.29%
Andreas Gruenbacher4122.04%114.29%
Jeff Mahoney3116.67%114.29%
Miklos Szeredi105.38%114.29%
Christoph Hellwig31.61%114.29%
David Howells10.54%114.29%
Stephen Hemminger10.54%114.29%
Total186100.00%7100.00%

/* * Inode operation listxattr() * * We totally ignore the generic listxattr here because it would be stupid * not to. Since the xattrs are organized in a directory, we can just * readdir to find them. */
ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) { struct dentry *dir; int err = 0; struct listxattr_buf buf = { .ctx.actor = listxattr_filler, .dentry = dentry, .buf = buffer, .size = buffer ? size : 0, }; if (d_really_is_negative(dentry)) return -EINVAL; if (!dentry->d_sb->s_xattr || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) return -EOPNOTSUPP; dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE); if (IS_ERR(dir)) { err = PTR_ERR(dir); if (err == -ENODATA) err = 0; /* Not an error if there aren't any xattrs */ goto out; } inode_lock_nested(d_inode(dir), I_MUTEX_XATTR); err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); inode_unlock(d_inode(dir)); if (!err) err = buf.pos; dput(dir); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton12063.16%18.33%
Jeff Mahoney3719.47%541.67%
David Howells189.47%18.33%
Al Viro136.84%325.00%
Christoph Hellwig10.53%18.33%
Linus Torvalds10.53%18.33%
Total190100.00%12100.00%


static int create_privroot(struct dentry *dentry) { int err; struct inode *inode = d_inode(dentry->d_parent); WARN_ON_ONCE(!inode_is_locked(inode)); err = xattr_mkdir(inode, dentry, 0700); if (err || d_really_is_negative(dentry)) { reiserfs_warning(dentry->d_sb, "jdm-20006", "xattrs/ACLs enabled and couldn't " "find/create .reiserfs_priv. " "Failing mount."); return -EOPNOTSUPP; } d_inode(dentry)->i_flags |= S_PRIVATE; reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " "storage.\n", PRIVROOT_NAME); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney4242.86%337.50%
Andrew Morton2525.51%225.00%
Al Viro2222.45%225.00%
David Howells99.18%112.50%
Total98100.00%8100.00%

#else
int __init reiserfs_xattr_register_handlers(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney11100.00%1100.00%
Total11100.00%1100.00%


void reiserfs_xattr_unregister_handlers(void) {}

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney6100.00%1100.00%
Total6100.00%1100.00%


static int create_privroot(struct dentry *dentry) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney14100.00%1100.00%
Total14100.00%1100.00%

#endif /* Actual operations that are exported to VFS-land */ static const struct xattr_handler *reiserfs_xattr_handlers[] = { #ifdef CONFIG_REISERFS_FS_XATTR &reiserfs_xattr_user_handler, &reiserfs_xattr_trusted_handler, #endif #ifdef CONFIG_REISERFS_FS_SECURITY &reiserfs_xattr_security_handler, #endif #ifdef CONFIG_REISERFS_FS_POSIX_ACL &posix_acl_access_xattr_handler, &posix_acl_default_xattr_handler, #endif NULL };
static int xattr_mount_check(struct super_block *s) { /* * We need generation numbers to ensure that the oid mapping is correct * v3.5 filesystems don't have them. */ if (old_format_only(s)) { if (reiserfs_xattrs_optional(s)) { /* * Old format filesystem, but optional xattrs have * been enabled. Error out. */ reiserfs_warning(s, "jdm-2005", "xattrs/ACLs not supported " "on pre-v3.6 format filesystems. " "Failing mount."); return -EOPNOTSUPP; } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney3367.35%375.00%
Andrew Morton1632.65%125.00%
Total49100.00%4100.00%


int reiserfs_permission(struct inode *inode, int mask) { /* * We don't do permission checks on the internal objects. * Permissions are determined by the "owning" object. */ if (IS_PRIVATE(inode)) return 0; return generic_permission(inode, mask); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney32100.00%1100.00%
Total32100.00%1100.00%


static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) { return -EPERM; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton1368.42%125.00%
Jeff Mahoney315.79%250.00%
Al Viro315.79%125.00%
Total19100.00%4100.00%

static const struct dentry_operations xattr_lookup_poison_ops = { .d_revalidate = xattr_hide_revalidate, };
int reiserfs_lookup_privroot(struct super_block *s) { struct dentry *dentry; int err = 0; /* If we don't have the privroot located yet - go find it */ inode_lock(d_inode(s->s_root)); dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, strlen(PRIVROOT_NAME)); if (!IS_ERR(dentry)) { REISERFS_SB(s)->priv_root = dentry; d_set_d_op(dentry, &xattr_lookup_poison_ops); if (d_really_is_positive(dentry)) d_inode(dentry)->i_flags |= S_PRIVATE; } else err = PTR_ERR(dentry); inode_unlock(d_inode(s->s_root)); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton5145.95%111.11%
Al Viro2421.62%222.22%
Jeff Mahoney1917.12%333.33%
David Howells1210.81%111.11%
Nicholas Piggin43.60%111.11%
Linus Torvalds10.90%111.11%
Total111100.00%9100.00%

/* * We need to take a copy of the mount flags since things like * SB_RDONLY don't get set until *after* we're called. * mount_flags != mount_options */
int reiserfs_xattr_init(struct super_block *s, int mount_flags) { int err = 0; struct dentry *privroot = REISERFS_SB(s)->priv_root; err = xattr_mount_check(s); if (err) goto error; if (d_really_is_negative(privroot) && !(mount_flags & SB_RDONLY)) { inode_lock(d_inode(s->s_root)); err = create_privroot(REISERFS_SB(s)->priv_root); inode_unlock(d_inode(s->s_root)); } if (d_really_is_positive(privroot)) { s->s_xattr = reiserfs_xattr_handlers; inode_lock(d_inode(privroot)); if (!REISERFS_SB(s)->xattr_root) { struct dentry *dentry; dentry = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); if (!IS_ERR(dentry)) REISERFS_SB(s)->xattr_root = dentry; else err = PTR_ERR(dentry); } inode_unlock(d_inode(privroot)); } error: if (err) { clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt); clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt); } /* The super_block SB_POSIXACL must mirror the (no)acl mount option. */ if (reiserfs_posixacl(s)) s->s_flags |= SB_POSIXACL; else s->s_flags &= ~SB_POSIXACL; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney9740.76%222.22%
Andrew Morton6728.15%333.33%
Al Viro5221.85%222.22%
David Howells187.56%111.11%
Linus Torvalds41.68%111.11%
Total238100.00%9100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Jeff Mahoney228552.50%2333.33%
Andrew Morton154335.45%45.80%
Al Viro1844.23%1420.29%
David Howells1774.07%34.35%
Andreas Gruenbacher511.17%22.90%
Miklos Szeredi220.51%11.45%
Christoph Hellwig160.37%45.80%
Vladimir V. Saveliev130.30%11.45%
Kirill A. Shutemov90.21%11.45%
Frédéric Weisbecker90.21%22.90%
Linus Torvalds80.18%22.90%
Deepa Dinamani80.18%22.90%
Jan Kara70.16%11.45%
Stephen Hemminger50.11%11.45%
Nicholas Piggin40.09%11.45%
Randy Dunlap30.07%11.45%
Tejun Heo30.07%11.45%
Ingo Molnar10.02%11.45%
Sachin Kamat10.02%11.45%
Greg Kroah-Hartman10.02%11.45%
Fabian Frederick10.02%11.45%
Jes Sorensen10.02%11.45%
Total4352100.00%69100.00%
Directory: fs/reiserfs
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