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6d848a488a
shmfs wants purely standard POSIX ACL semantics, so we can use the new generic VFS layer POSIX ACL checking rather than cooking our own 'permission()' function. Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
#ifndef __SHMEM_FS_H
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#define __SHMEM_FS_H
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#include <linux/swap.h>
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#include <linux/mempolicy.h>
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/* inode in-kernel data */
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#define SHMEM_NR_DIRECT 16
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struct shmem_inode_info {
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spinlock_t lock;
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unsigned long flags;
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unsigned long alloced; /* data pages alloced to file */
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unsigned long swapped; /* subtotal assigned to swap */
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unsigned long next_index; /* highest alloced index + 1 */
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struct shared_policy policy; /* NUMA memory alloc policy */
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struct page *i_indirect; /* top indirect blocks page */
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swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
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struct list_head swaplist; /* chain of maybes on swap */
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struct inode vfs_inode;
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};
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struct shmem_sb_info {
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unsigned long max_blocks; /* How many blocks are allowed */
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unsigned long free_blocks; /* How many are left for allocation */
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unsigned long max_inodes; /* How many inodes are allowed */
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unsigned long free_inodes; /* How many are left for allocation */
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spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
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uid_t uid; /* Mount uid for root directory */
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gid_t gid; /* Mount gid for root directory */
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mode_t mode; /* Mount mode for root directory */
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struct mempolicy *mpol; /* default memory policy for mappings */
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};
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static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
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{
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return container_of(inode, struct shmem_inode_info, vfs_inode);
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}
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#ifdef CONFIG_TMPFS_POSIX_ACL
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int shmem_check_acl(struct inode *, int);
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int shmem_acl_init(struct inode *, struct inode *);
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extern struct xattr_handler shmem_xattr_acl_access_handler;
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extern struct xattr_handler shmem_xattr_acl_default_handler;
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extern struct generic_acl_operations shmem_acl_ops;
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#else
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static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
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{
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return 0;
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}
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#endif /* CONFIG_TMPFS_POSIX_ACL */
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#endif
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