PWN-Hunter/android_kernel_xiaomi_sdm845
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Use lock_page_killable

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Replacing lock_page with lock_page_killable in do_generic_mapping_read()
allows us to kill `cat' of a file on an NFS-mounted filesystem

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
This commit is contained in:
Matthew Wilcox 2007-12-06 11:19:57 -05:00 committed by Matthew Wilcox
parent 2687a3569e
commit 0b94e97a25
1 changed files with 7 additions and 4 deletions
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11
mm/filemap.c
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@ -982,7 +982,8 @@ void do_generic_mapping_read(struct address_space *mapping,
page_not_up_to_date:
/* Get exclusive access to the page ... */
lock_page(page);
if (lock_page_killable(page))
goto readpage_eio;
/* Did it get truncated before we got the lock? */
if (!page->mapping) {
@ -1010,7 +1011,8 @@ void do_generic_mapping_read(struct address_space *mapping,
}
if (!PageUptodate(page)) {
lock_page(page);
if (lock_page_killable(page))
goto readpage_eio;
if (!PageUptodate(page)) {
if (page->mapping == NULL) {
/*
@ -1021,15 +1023,16 @@ void do_generic_mapping_read(struct address_space *mapping,
goto find_page;
}
unlock_page(page);
error = -EIO;
shrink_readahead_size_eio(filp, ra);
goto readpage_error;
goto readpage_eio;
}
unlock_page(page);
}
goto page_ok;
readpage_eio:
error = -EIO;
readpage_error:
/* UHHUH! A synchronous read error occurred. Report it */
desc->error = error;